Jig including torque measuring means



Feb. 1, 1966 F. SIEGLER JIG INCLUDING TORQUE MEASURING MEANS Filed Feb. 18, 1963 4 Sheets-Sheet 2 IN VENT 0R FRED SIEGLER BY KBVDR/CKmdSTOLZY A T TORNEYS Feb. 1, 1966 F. SIEGLER 3,232,101

JIG INCLUDING TORQUE MEASURING MEANS Filed Feb. 18, 1965 4 Sheets-Sheet 3 I N VENTOR F/G 4 FRED S/EGLER BY KENDR/CK and STDLZY A TTORNE Y5 Feb. 1, 1966 F. SIEGLER JIG INCLUDING TORQUE MEASURING MEANS 4 Sheets-Sheet 4.

Filed Feb. 18, 1 963 INVE/V 70/? FRED S/EGLER BY K ENDR/(ZmdS 7' OLZ Y A 7' TOIPNE Y5 FIG. 7.

versatile.

United States Patent Ofiiice Patented Feb. I, 1966 3,232,101 JIG INCLUDING TORQUE MEASURING MEANS Fred Siegler, 3W5 W. 4th St., Los Angeles, Calif. Filed Feb. 18, 1963, Ser. No. 259,220 3 Claims. (Ci. 73-134) This invention relates to the art of assembling and disassembling mechanical structures in their production or maintenance, and more particularly to a simple, yet unusually effective device for holding a work piece body while separate component parts of a unitary Whole are mounted thereon or are removed therefrom.

lthough this invention may have a great many applications other than those specifically described herein and therefore should not be limited thereto for this reason, the present invention has been found to be especially useful in the assembly of a type of fuel injector unit fora diesel engine having an injector nut threaded to an injector body. When the nut is tightened, it holds all the internal parts of the injector in their respective operating positions. Such an injector is manufactured and sold by the General Motors Corporation. Notwithstanding this utility of the present invention, it may also be found to be useful in jigging a diesel engine fuel injector unit of a different type employing a threaded injector cup from which the fuel is sprayed through pin holes therein. In this latter type of injector, the cup is also threaded to the injector body. The Cummins Engine Company manufactures and sells this type of injector.

In the assembly of an injector incorporating either an injector nut or an injector cup, for the satisfactory operation of each, it is necessary to apply a torque to the nut or cup within a predetermined range.

Complicated torque measuring devices employing helical compression springs have been employed in the prior art.

In the assembly or disassembly of either type of such injectors it has also been necessary to employ a particular kind of injector jig to allow for easy access to either end of an injector.

In the past, jigs have been provided for injector units. However, the same have required a considerable number of complicated component parts. In addition, such jigs have been provided with torque indicators having only one range. For this reason, the same have not been That is, it has not in the past been possible to use the same jig to assemble or disassemble two different kinds of injector units.

In the prior art, a rotatable plate was provided which was rotatable about an axis through its center rather than at the edge of the plate. This therefore made it necessary, when an injector unit was fixed relative to the plate by a pair of vise jaws carried thereby, to provide locking means for the plate in each of its two horizontal positions. That is, the plate was held in one position 180 from its other position to provide for easy access to each end of an injector unit.

The above described and other disadvantages of the prior art are overcome by providing a jig having relatively few uncomplicated component parts. Further, the jig of the present invention is provided with an adjustable meter cam to facilitate the use of the jig thereof in the assembly or disassembly of more than one type of injector unit.

In accordance with one feature of the present invention, a jig is provided including a base, a plate having means thereon to hold a work piece, means mounting the plate on the base in a position rotatable about a horizontal axis at one edge thereof and in a position such that the plate may be supported on said base in either one of two horizontal positions extending in corresponding opposite directions from the base. In this case, the plate is simply flipped from one side to the other to provide for easy access to either end of an injector unit which may be held on the plate by a pair of vise jaws. Thus, the prior art latching mechanism is obviated in that the weight of the plate and injector keep the plate in either one of two horizontal positions extending from the base in positions apart from each other. For this reason, stop means may be provided to limit the rotation of the plate employed in the jig of the present invention.

In accordance with another feature of the present in vention, a jig is provided including a base and carriage at the upper end thereof having spaced shoulders thereon, a yoke including a yoke plate having a pair of spaced shoulders at one edge thereof to fit between the carriage shoulders, a cam shaft rotatably mounted through all of the shoulders, a cam having a curved surface, the cam being fixed to the. cam shaft in a position between the yoke shoulders, a crank assembly fixed to the cam shaft to rotate the same, and jaw means on the yoke plate movale to engage a work piece by rotation of the cam on said cam shaft. From the foregoing, it will be appreciated that an extremely simple yet effective jig is provided wherein the rotatable character of the yoke plate is achieved about a cam shaft on which a vise jaw cam is positioned.

According to another feature of the present invention, a torque measuring device is provided including base means, carriage means rotatable about an approximately vertical axis on the base means, means to resist yieldingly rotation of the carriage means, a mechanical deflection indicator having a case and a member movable into and out of said case to operate the indicator, the case being fixed to one of said base and carriage means, and a meter cam fixed to the other of the base and carriage means, the meter cam having an inclined surface to engage the member and to move the member relative to the case approximately in proportion to the amount of rotation of the carriage means on said base means.

In this case, a conventional mechanical deflection indicator may easily be employed economically. 7

According to still another feature of the present invention, a torque measuring device is provided including a base, a carriage rotatable about an approximately vertical axis on the base, meter means to indicate the amount of rotation of the carriage on the base, and a torsion rod having one of its ends fixed to the base and the other end thereof fixed to the carriage. In this case, torsion rod is employed in lieu of the complicated prior art compression spring system.

In accordance with a feature of the present invention, the torsion rod is positioned adjacent one end of a base supporting web and the mechanical deflection indicator positioned at the other end of the web to increase the amount of deflection for a given torque.

The above-described and other advantages of the present invention will be better understood from the following description when considered in connection with the accompanying drawings.

In the drawings which are to be regarded as merely illustrative:

FIG. 1 is a top plan view of the jig of the present invention;

FIG. 2 is a longitudinal sectional view of the jig taken on the line 2-2 shown in FIG. 1;

FIG. 3 is a view partly in section of a portion of a meter cam taken on the line 3-3 shown in FIG. 2;

FIG. 4 is a tranverse sectional view taken on the line 44 shown in FIG. 2;

FIG. 5 is a view partly in section of a stop taken on the line 5-5 shown in FIG. 2;

FIG. 6 is..a perspective view of a yoke which is employed in the jig of the present invention;

FIG. 7 is a broken away sectional view of a vise jaw biasing spring taken on the line 7-7 shown in FIG. 1; and

FIG. 8 is a horizontal sectional view of the vise jaw biasing spring taken on the line 88 shown in FIG. 7.

In the drawings in FIG. 1, the jig of the present invention is indicated generally at 10 including a base 11. Base -11 includes a base plate 12 which has four bolt holes 13 therethrough by means of which jig 10 may be mounted to a flat surface. Base 11 also includes four triangularly shaped Webs 14 which brace a body web portion 15 upon which a carriage 16 is mounted.

Carriage 16 is rotatable to a certain extent upon an upper substantially fiat surface 17 of web 15. Carriage 16 is rotatable about a vertical axis of a torsion rod 13 shown in FIG. 2. Carriage 16 carries a yoke 19 as shown in FIG. 1 which is rotatable about the axis of a cam shaft 213 shown in FIG. 2.

Carriage 161s provided with a pair of shoulders 21 and 22 adjacent which shoulders 23 and 24, respectively, of yoke 19 are positioned. Shoulders 23 and 24 of yoke 19 are themselves spaced apart. A cam 25 is positioned therebetween.

Cam shaft extends through all of the shoulders 21, 22, 23 and 24 and also through cam 25. A pin 26- is press fit into a position extending transversely through cam and cam shaft 20 that holds cam 25 in a fixed position relative to shaft 20. A conventional mechanical movement indicator 27 issupported in a bore 28 in carriage 16, indicator 27 having a case 29 with a shank portion 30 press fit into bore 28. A pin 31 extends outwardly of meter body shank 311 and is movable thereinto depending upon the position of a pinpoint 32 on the upper surface of a meter cam 33 which is located in a recess 34 in web 15.

As shown in FIG. 1, shoulders 21 and 22 of carriage 16 are provided with oil holes at 35 and 36 respectively for cam shaft 29.

As shown in FIG. 6, yoke 19 is provided with webs 37 and 38 respectively, fixed to shoulders 23 and 24 and to a yoke plate 39. Yoke plate 39 is provided with an opening 40 to receive an injector unit. A hole 40 is provided through yoke plate 39 to hold an injector unit in a certain angular orientation relative to yoke plate 39. For this reason, locating hole 41) is selected to fit a particular type of injector unit appendage. Yoke plate 39 also is provided with bolt holes 41 through which bolts 42 project that hold a fixed jaw 43 in the position on yoke plate 39 shown in FIG. 1. As shown in FIG. 4, nuts 44 are threaded to the lower ends of bolts 42.

A second vise jaw 45 is rotatably mounted on yoke plate 39 about a vertical axis of a bifurcated pin 46. law 45 is providedwith a body portion 46 and a face plate 47 which are held togetherby means of an Allen head screw 48 as shown in FIG. 8. Cam shaft 20 is rotated about its axis by means of a crank assembly 49 which is fixed to cam shaft 20 by means of an Allen head .set screw 50 that seats on a flat keyway surface 51 on .cam shaft 29 as shown in both FIGS. 1 and 2.

As shown in FIG. 2, torsion rod 18 is proyided with upper and lower flat keyway surfaces at 52 and 53 against which Allen head screws 54 and 55 fit, screws 54 and 55 being threaded respectively through carriage 16 and through web 15 into bores 56 and 57, respectively, of carriage 16 and web 15. Torsion rod 18 is in fact located in web bore 57 and extends upwardly into carriage bore 56.

In the operation of the jig 10, an injector unit is positioned between vise jaws 43 and 45. Crank assembly 49 is then rotated to the left as viewed from the crank assembly end of the jig 10 shown in FIG. 1 to bring jaw 45 in engagement with an injector unit. An injector unit, when so held between jaw 43 and 45 is so indicated in dotted lines at 58 in FIG. 4. The upper end of the injector as viewed in FIG. 4 may then beworked upon in the position shown in 1 16. 4. The entire yoke 19 may then be rotated 180 with cam shaft 20 because with the injector in place items 58, 19, 2t), 25 and 49 are locked together but can rotate in piece 16, so that the lower end of injector unit 58 as shown in FIG. 4 will be uppermost. In this case, said lower end of injector unit 58 may be worked upon.

In either position, the injector nut, which actually includes the entire lower assembly indicated at 59 of injector unit 58, may be tightened. Carriage 16 in this case will rotate about the axis of torsion rod 18. Rotational movement of carriage 16 about the axis of torsion rod 18 is limited to the width of a stop pin slot 60 in carriage 16, as shown in FIG. 5. A stop pin 6-1, in this case, is press fit into a bore 62 in web 15. Stop pin 61 then projects upwardly into slot 60 in carriage 16. As shown in FIG. 3, meter cam 33 is provided with an inclined surface 63 and a surface 64, which is also inclined, but the inclination of which is not visible to the eye in the drawings, because of the relatively small angle of its inclination.

Surfaces 63 and 64 are the only surfaces upon cam 33 which pinpoint 33 contacts during the operation of the jig 113. The position of cam 33 in recess 34 is adjustable with a set screws 65 and 66 which also wedge cam 33 against the bottom surface 67 of recess 34 by engagement of screws 65 and 66 respectively with tapered surfaces 68 and 69 on meter cam 33.

As is evident from FIGS. 2 and 4, torsion rod 18 is symmetrical about its vertical axis with the exception of the keyway surfaces 52 and 53.

As shown in FIG. 7, pin 46' is provided with a slot 70 into which the end of a spiral spring 71 is positoned at 72 as shown in FIG. 8. The other end of the spring 72 is hooked into vise jaw body 46 at 73. Pin 46' is provided with a head 74 which has been removed in FIG. 1 to illustrate the function of spiral spring 71.

The lower end of pin 46' is threaded at 75. A nut 76 is threaded to pin end to hold pin 46' in a substantially fixed position relative to yoke plate 39.

From the foregoing, it will be appreciated that, if desired, jaws 43 and 45 may be made in a shape such that the same may be interchangeable.

In accordance with an outstanding feature of the present invention, stop means are provided on the lower ends of shoulders 23 and 24 to engage the flat surface of carriage 16 at S as shown in FIG. 4 to hold yoke plate 39 in the position shown in FIG. 4 or in a position rotated about cam shaft 20 to the right as viewed in FIG. 4, whereby easy access to either end of injector unit 58 may be provided. In accordance with another outstanding feature of the present invention, cam 25 is provided on the self same cam shaft 21) about which yoke plate 39 is rotatable. Still another outstanding feature of the present invention resides in the use of meter 27 which may be conyentional and which therefore may be economical to acquire and put to use in the jig 10 of the present invention.

Still another feature of thepresent invention resides in the use of the torsion rod 18 in lieu of the complicated helically coiled compression springs of the prior art. Still further, the use of torsion rod 18 at one end of web 15 and the use of meter 27 at the other end thereof provides for a large deflection of meter 27 in response to a relatively small torque applied to injector nut 59. In accordance with another feature of the present invention,

meter cam 33 is easily adjustable to provide two range readings for meter 27 due to the two different slopes of cam surfaces 63 and 64 shown in FIG. 3. Different tubes of injector units therefore may be assembled and disassembled on the self same jig 10.

Although only one specific embodiment of the present invention has been described and illustrated herein, many changes and modifications will of course suggest themselves to those skilled in the art. This single embodiment has been selected for this disclosure for the purpose of illustration only. The present invention should therefore not be limited to the embodiment so selected, the true scope of the invention being defined only in the appended claims.

What is claimed is:

1. A torque measuring device comprising: base means; carriage means rotatable about an approximately vertical axis on said base means; means to resist yieldingly rotation of said carriage means; a mechanical deflection indicator having a case and a member movable into and out of said case to operate the indicator, said case being fixed to one of said base and carriage means; a meter cam fixed to the other of said base and carriage means, said meter cam having an inclined surface to engage said member and to move said member relative to said case approximately in proportion to the amount of rotation of said carriage means on said base means; mounting means to retain said meter cam in a position slidable in a direction transverse to the axis of said movable member; and adjustable means to hold said meter cam in a fixed position in said mounting means, said meter cam having two surfaces of two different slopes, either one of said surfaces contacting said movable member depending upon the position of said meter cam as it is moved by said adjustable means.

2. A torque measuring device comprising: base means; carriage means rotatable about an approximately vertical axis on said base means; means to resist yieldingly rotation of said carriage means; a mechanical deflection indicator having a case and a member movable into and out of said case to operate the indicator, said case being fixed to one of said base and carriage means; a meter cam fixed to the other of said base and carriage means, said meter cam having an inclined surface to engage said member and to move said member relative to said case approximately in proportion to the amount of rotation of said carriage means on said base means; mounting means to retain said meter cam in a position slidable in a direction transverse to the axis of said movable member; and adjustable means to hold said meter cam in a fixed position in said mounting means, said meter cam having two surfaces of two ditferent slopes, either one of said surfaces contacting said movable member depending upon the position of said meter cam as it is moved by said adjustable means, said mounting means including a recess with a flat surface at the bottom thereof in one of said base and carriage means, the ends of said meter cam being tapered toward each other away from flat surface, said mounting means including a set screw at each end of said meter cam to engage corresponding ones of said tapered meter cam ends to hold said meter cam in a fixed position wedge against said flat surface.

3. A jig comprising: a base and a carriage at the upper end thereof having spaced shoulders thereon; a yoke in cluding a yoke plate having a pair of spaced shoulders at one edge thereof to fit between said carriage shoulders; a cam shaft rotatably mounted through all of said shoulders; a cam having a curved surface, said cam being fixed to said cam shaft in a position between said yoke shoulders; a crank assembly fixed to said cam shaft to rotate the same; jaw means on said yoke plate movable to engage a work piece by rotation of said cam on said cam shaft; a torsion rod having one of its ends fixed to said base means and the other end thereof fixed to said carriage means, said carriage means being rotatable on said base means about an approximately vertical axis the same as that of said torsion rod; and meter means to indicate the amount of rotation of said carriage means on said base means.

References Cited by the Examiner UNITED STATES PATENTS 599,522 2/1898 Barns 73-135 2,127,708 2/ 1915 Wilbur 269-76 X 1,409,266 3/ 1922 Werth 269-73 X 2,700,298 1/ 1955 Anderson 73-9 2,788,687 4/1957 Ridge 269-229 X 2,833,145 5/1958 McCullough 73-144 2,969,231 1/ 1961 Mills 269-69 3,026,724 3/1962 Gstalder 73-136 FOREIGN PATENTS 858,045 5/ 1940 France. 1,207,946 9/1959 France.

838,542 6/1960 Great Britain.

' RICHARD C. QUEISSER, Primary Examiner. 

1. A TORQUE MEASURING DEVICE COMPRISING: BASE MEANS; CARRIAGE MEANS ROTATABLE ABOUT AN APPROXIMATELY VERTICAL AXIS ON SAID BASE MEANS; MEANS TO RESIST YIELDINGLY ROTATION OF SAID CARRIAGE MEANS; A MECHANICAL DEFLECTION INDICATOR HAVING A CASE AND A MEMBER MOVABLE INTO AND OUT OF SAID CASE TO OPERATE THE INDICATOR, SAID CASE BEING FIXED TO ONE OF SAID BASE AND CARRIAGE MEANS; A METER CAM FIXED TO THE OTHER OF SAID BASE AND CARRIAGE MEANS, SAID METER CAM HAVING AN INCLINED SURFACE TO ENGAGE SAID MEMBER AND TO MOVE SAID MEMBER RELATIVE TO SAID CASE APPROXIMATELY IN PROPORTION TO THE AMOUNT OF ROTATION OF SAID CARRIAGE MEANS ON SAID BASE MEANS; MOUNTING MEANS TO RETAIN SAID METER CAM IN A POSITION SLIDABLE IN A DIRECTION TRANSVERSE TO THE AXIS OF SAID MOVABLE MEMBER; AND ADJUSTABLE MEANS TO HOLD SAID METER CAM IN A FIXED POSITION IN SAID MOUNTING MEANS, SAID METER CAM HAVING TWO SURFACES OF TWO DIFFERENT SLOPES, EITHER ONE OF SAID SURFACES CONTACTING SAID MOVABLE MEMBER DEPENDING UPON THE POSITION OF SAID METER CAM AS IT IS MOVED BY SAID ADJUSTABLE MEANS. 